Pubbe kira mahātherā vassūpanāyikāya imameva suttaṃ paṭṭhapenti. Kiṃkāraṇā? tīṇi piṭakāni vibhajitvā kathetuṃ labhissāmāti. Tepiṭakena hi samodhānetvā Kathentassa dukkathitanti kenaci na sakkā vattuṃ. Tepiṭakaṃ vibhajitvā kathitameva idaṃ suttaṃ sukathitaṃ hotīti.

Catusatipaṭṭhānavaṇṇanā

[289] Kusalassādhigamāyāti maggakusalassa ceva phalakusalassa ca adhigamatthāya. Ubhayaṃpi hetaṃ anavajjaṭṭhena khemaṭṭhena vā kusalameva. Tattha sammā samādhiyatīti tasmiṃ ajjhattakāye sammā samāhito ekaggacitto hoti. Bahiddhā parakāye ñāṇadassanaṃ abhinibbattetīti attano kāyato parassa kāyābhimukhaṃ ñāṇaṃ peseti. Esa nayo sabbattha. Sabbattheva ca satimāti padena kāyādipariggāhikā